Which of the following statements about thermal radiation is always true?

-A hot object emits more radiation per unit surface area than a cool object.

-All the light emitted by hot object has higher energy than the light emitted by a cooler object.

-A hot object produces more total infrared emission than a cooler object.

-A cold object produces more total infrared and radio emission per unit surface area than a hot object.

He sandals were out in the sun so the got hotter. which is why her feet felt hot.

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

An adiabatic process is one which occurs without the transfer or matter or heat in a system.

An em wave does not require a medium, while a mechanical wave does.